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Risk diversification and vote decisions in mixed-member electoral systems

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  • Susumu Shikano

    (University of Konstanz)

  • Erik S. Herron

    (West Virginia University)

Abstract

This paper builds on the literature about mixed-member electoral systems, exploring how ballot design interacts with voter behavior. We present a theoretical model for vote decision-making in mixed-member systems that takes into account the interaction between both tiers. The model is grounded in a spatial model for vote decision-making under risk and inspired by the logic of portfolio diversification under risk. Accordingly, voters are modeled as risk-averse decision-makers who may prefer diversified vote packages (i.e. split-ticket) when party and candidate uncertainties are highly correlated. The risk diversification strategy abates when voters cast their votes sequentially. This finding provides a potential explanation for the impact of vote sequence in mixed-member systems, an under-investigated topic in the literature. It thus links the established literature on mixed-member systems with scholarship on ballot design and its effects. Additionally, the paper’s analysis explores the implications of combining the proposed model with the well-established wasted vote model.

Suggested Citation

  • Susumu Shikano & Erik S. Herron, 2025. "Risk diversification and vote decisions in mixed-member electoral systems," Public Choice, Springer, vol. 204(1), pages 203-219, July.
    • Handle: RePEc:kap:pubcho:v:204:y:2025:i:1:d:10.1007_s11127-025-01301-5
    DOI: 10.1007/s11127-025-01301-5
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